Looking like a wasp is an adaptation assumed by many different species of flies. Looking like a really huge wasp is more rare, but this Mydas fly Mydas clavatus has it down. It has a wasplike flight and measures a full inch in length, making it one of the largest true flies around. Its larvae feed on beetle grubs in the soil, and adults visit flowers for nectar. It may look scary but its one of the most beneficial insects in the yard.